XdbeSwapBuffers

XdbeSwapBuffers(3X11)		 X FUNCTIONS		XdbeSwapBuffers(3X11)



NAME
       XdbeSwapBuffers - swaps front and back DBE buffers.

SYNOPSIS
       #include <X11/extensions/Xdbe.h>

       Status XdbeSwapBuffers(
	   Display	*dpy,
	   XdbeSwapInfo *swap_info,
	   int		num_windows)

DESCRIPTION
       This  function swaps the front and back buffers for a list of windows.
       The argument num_windows specifies how many windows are to have	their
       buffers	swapped; it is the number of elements in the swap_info array.
       The argument swap_info specifies the information needed per window  to
       do the swap.

       The XdbeSwapInfo structure has the following fields:

	    Window	      swap_window
	    XdbeSwapAction    swap_action

       swap_window   specifies	 the   window  for  which  to  swap  buffers.
       swap_action specifies the swap action to use for this swap_window.

       swap_action determines what will happen to the new back buffer of  the
       swap_window  it	is  paired with in the list in addition to making the
       old back buffer become visible.	The defined actions are as follows:


       XdbeUndefined
	      The contents of the new back buffer become undefined.  This may
	      be the most efficient action since it allows the implementation
	      to discard the contents of the buffer if it needs to.

       XdbeBackground
	      The unobscured region of the new back buffer will be tiled with
	      the window background.  The background action allows devices to
	      use a fast clear capability during a swap.

       XdbeUntouched
	      The unobscured region of the new back buffer will be unmodified
	      by the swap.

       XdbeCopied
	      The  unobscured  region of the new back buffer will be the con-
	      tents of the old back buffer

ERRORS
       BadMatch
	      A non-double-buffered window was	specified  or  a  window  was
	      specified twice.

       BadWindow
	      An invalid window was specified.

       BadValue
	      An invalid swap action was specified.

SEE ALSO
       DBE,  XdbeAllocateBackBufferName(),  XdbeBeginIdiom(), XdbeDeallocate-
       BackBufferName(),	XdbeEndIdiom(),		XdbeFreeVisualInfo(),
       XdbeGetBackBufferAttributes(),	XdbeGetVisualInfo(),  XdbeQueryExten-
       sion().




							XdbeSwapBuffers(3X11)